Ontology

When google-ing the term "ontology":

/ɒnˈtɒlədʒi/

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noun

noun: ontology; plural noun: ontologies

1. the branch of metaphysics dealing with the nature of being.
2. a set of concepts and categories in a subject area or domain that shows their properties and the relations between them.

"what's new about our ontology is that it is created automatically from large datasets"

From WikiPedia:

Ontology is the philosophical study of being. More broadly, it studies concepts that directly relate to being, in particular becoming, existence, reality, as well as the basic categories of being and their relations.^[1] Traditionally listed as a part of the major branch of philosophy known as metaphysics, ontology often deals with questions concerning what entities exist or may be said to exist and how such entities may be grouped, related within a hierarchy, and subdivided according to similarities and differences.